Functional Group Analysis of Reaction Products from Thermolysis of Lignin in Ethylene Glycol and Diethylene Glycol

Chiaki Yokoyama, Kazuhiko Nishi, Shinji Takahashi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Thermolysis of lignin in ethylene glycol and in diethylene glycol was studied. The experiments were carried out at 573 K and 623 K for 3 h. The reaction products of the thermolysis in ethylene glycol at 573 K and 623 K and in diethylene glycol at 623 K but not at 573 K separated into two liquid phases. The lower phase consisted of the glycol, major component, and water-soluble components, while the upper phase was a dark brown oil. Using the data from elemental analysis, 1H-NMR, and 13C-NMR, the distribution of hydrogen and carbon was determined and the concentrations of 13 kinds of functional groups selected were determined from structural characterization analysis. Two methods were tested: the first (Method 1) used elemental analysis and 1H-NMR data, while the second (Method 2) used not only elemental analysis and 1H-NMR data but also 13C-NMR data. The two methods gave results considerably dissimilar for concentrations of functional groups containing an oxygen atom such as furan ring, glucose-unit secondary alcohol, and glucose-unit hemiacetal groups. This result may suggest that both 1H-NMR and 13C-NMR data are indispensable for estimating the concentrations of these functional groups, which are the characteristics of lignin thermolysis oils. Method 2 is found to be superior for the structural characterization analysis of complex mixtures with high oxygen contents, e.g., lignin thermolysis oils and wood tars.

Original languageEnglish
Pages (from-to)576-583
Number of pages8
JournalSekiyu Gakkaishi (Journal of the Japan Petroleum Institute)
Volume37
Issue number6
DOIs
Publication statusPublished - 1994 Jan 1

Keywords

  • Diethylene glycol
  • Ethylene glycol
  • Functional group analysis
  • Lignin
  • Thermolysis

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology

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